* [http://www.cenbii.eu CEN Workshop on Business Interoperability Interfaces for public procurement in Europe]
== Laskutus ==
* [https://standards.cen.eu/dyn/www/f?p=204:7:0::::FSP_ORG_ID:1883209&cs=1E81C9C833655EEDC7010C8D0A2FB786C CEN/TC 434 - Electronic Invoicing]
* [http://www.cen.eu/work/areas/ict/ebusiness/pages/einvoicing.aspx cen.eu - eInvoicing] sähköisen laskutuksen workshop tulokset